Sanding device



Feb. 21, 1956 Filed Feb. 9, 1953 A. R. BAER SANDING DEVICE 2 Sheets-Sheet l s: Sr

I N V EN TOR. /qjr//v l?. 5461? A. R. BAER SANDING DEVICE.

Feb. 2l, 1956 2 Sheets-Shes?l 2 Filed Feb. 9, 1953 m. w n m Hair/,v l?. 5,45@

iilnited States Patent O SANDING DEVICE Austin R. Baer, Chestnut Hills, Mass. Application February 9, 1953, Serial No. 335,959

Claims. (Cl. 51-170) The present invention relates to a sanding device in general and to a multiple sanding device in particular.

Sanding devices, the operating part of which performs a reciprocating movement or a rotating movement, have been proposed before. Sanding devices which permitted different movements, in which, however, one operating part had to be removed before another operating part could be attached, have also been known. Yet this arrangement required a time consuming exchange of operating parts, if a shift from one movement to another was desired.

It is, therefore, one object of the present invention to provide a sanding device which has at least two operating parts permanently secured to the device and a single driving force drives one or the other operating part by means of simple shifting means.

It is another object of the present invention to provide a sanding device which has at least two operating parts, one of which may be exchangeably connected with a single driving force by a hand operating coupling lever.

It is still another object of the present invention to provide a sanding device which has at least two operating parts to be put in operative position by a mere tilting of the housing of the device, one of which operating parts may be exchangeably connected automatically with a single driving force by the mere tilting of the housing of one to the other operating position.

It is yet another object of the present invention to provide a sanding device which permits of use of two operating parts in a continuously interchangeable action.

With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

Figure l is perspective front view of the sanding device;

Fig. 2 is a sectional elevation of a sanding device having a reciprocating and a rotating operating member with hand-lever shifting of the drive to the respective members;

Fig. 3 is a sectional view along the lines 3 3 of Fig. 2;

Fig. 4 is a fragmentary sectional view along the lines 4--4 of Fig. 2;

Fig. 5 is a sectional elevation of a second embodiment of the drive for the respective operating members with shifting means operated by a mere tilting of the housing into the respective operative positions;

Fig. 6 is a sectional view along the lines 6 6 of Fig. 5;

Fig. 7 is a sectional elevation of a third embodiment of the drive for the respective operating members with shifting means likewise operated by a mere tilting of the housing into the respective operative positions;

Fig. 8 is a sectional view along the lines 8-8 of Fig. 7;

Fig. 9 is a sectional elevation of a fourth embodiment of the drive for the respective operating members with shifting means also operated by a mere tilting of the housing into the respective operating positions; and

Fig. l0 is a sectional view along the lines 10-10 vof F Fig. 9.

Referring now to the drawings, and in particular to Figs. 1 to 4, the sanding device will now be described with two operating members, namely by example one member reciprocating in longitudinal direction and another member rotating upon an axis extending crosswise through the device.

The sanding device comprises a housing 1 having a compartment 2 for the motor 3, which is preferably an electric motor, a compartment 4 for the reciprocating member 5 and a part of its drive (to be described below), and a compartment 6 for the rotating member 7 as well as for the driving means for the respective operative members.

The motorshaft Y3 carries a bevelled gear 9 which meshes a bevelled gear 10 keyed on a cross-shaft 1l properly supported by bearings. The cross-shaft 11 is equipped with a coupling member 12 one member 13 of which rotates with the cross-shaft 11 while its other member 14 sits loosely on the cross-shaft 11 and is secured to a chaingear 15 which is adapted to drive a second chain-gear 16 by means of a chain 17. The second chain-gear 16 is mounted on the axis of the rotating member '7 and when the members 13 and 14 are in coupled position the electric motor 3 drives over the gears 9, 10, l5 and 16 the rotating sander 7.

A double-armed hand-lever 18, both arms of which are forked, is provided to shift the member 13 from the uncoupled into the coupled position and vice-versa. One arm 19 of the lever 18 extends through a slot 20 of the top wall of the housing, so as to permit of gripping of the hand lever 18 from the outside of the housing 1. The forked portion of the arm 19 receives the crosslshaft 1li.. The lever 18 is pivoted upon an axis 21 which is disposed in longitudinal direction in the housing 1 and is held in position by means of a bracket 22 or any other suitable means. While the arm 19 of the lever 13 extends substantially in upward direction, the other arm 23 of the lever 18 extends substantially crosswise in the housing 1 and is also equipped with a forked portion.

The bevelled gear 10 mounted on the cross-shaft 11 meshes not only the bevelled gear 9, but also bevelled gear 24 mounted on a vertical shaft 25, the lower end of which carries another bevelled gear 26. The vertical shaft 223' is properly supported by bearings.

Acoupling member 27 is disposed between the gears 24 and 26, one member 2S of which is keyed to the vertical shaft 25 while its other member 29 turns loose on the vertical shaft 25 and is secured to the bevelled gear 26 which is rotatably mounted on the vertical shaft 25.

'I'he arm 23 of the double-armed lever 18 is adapted to operate the member 28 of the coupling member 27 and, thereby to put the reciprocating member 5 in and out of operation, respectively.

The bevelled gear 26 meshes another bevelled gear 36 which is keyed to a shaft 31 disposed in longitudinal direction in the housing 1. The shaft 31 is equipped with a cam groove 32 which is adapted to receive a pin 33 extending upwardly from the reciprocating member 5. The housing 1 is equipped with anges 34 on opposite sides and the reciprocating member is of U-shaped cross section and of a width complementary with the width of the housing 1. A screw bolt 35 extends through a longitudinal slot 36 of each of the anges 34 and is secured in a properly threaded boring 37 of the sides of the member 5. The latter is thus retained in the housing 1 and permits of reciprocating movement. The member 5, as well as the drum 7, may be equipped with sandpaper or the like by conventional means.

The present structure provides a common drive for both operating members 5 and 7, though, when the reciproacting member 5 is in operation, the drum 7 stands still,

since the shifting of the coupling member 27 into the coupled position automatically shifts they coupling memf ber 12 into the uncoupled position. On the other hand, if the coupling member 12 is shifted into coupled position for driving the drum 7, the coupling member 27 is automatically shifted into the uncoupled position, due to the simultaneous operation of both coupling members 12 and 27 by the double-armed lever 18.

As indicated in Fig. l, a handle 38 may be pivoted to the housing in order to permit of easy movement of the device along the surface of a workpiece to be sanded. The front end of the housing 1 carries a dome-shaped body 39 forming a second handle.

Referring now to Figs. 5 and 6, which discloses a structure automatically shifting the drive from one operating member to the other merely' by tilting of the housing of the sanding device, the reciprocating operating member is disposed here in the same manner as shown particularly clearly in Fig. 2.

The motor shaft 8" carries a bevelled gear 9 and is equipped with a coupling member 12 one member 13' of which is keyed to the shaft 8' whilethe other member 14 is rotatably mounted on the shaft 8'. Secured to the member 14 is another bevelled gear 10' which meshes a further bevelled gear a which is secured to a crossshaft 11'. The latter carries a chain gear 15 which drives over a chain 17' a second chain gear 16 which drives the drum 7.

The double lever 18 having the forked arms 19 and 23 is adapted to operate simultaneouslyl the coupling members 12 and 27. The double lever 18 is properly pivoted and is equipped with downwardly extending legs 40 which bring about the automatic shifting of the drive from one operating member to the other operating member.

The bevelled gear 9 meshes a further bevelled gear 24 which is keyed to a vertical shaft 25 on which the coupling member 27 is disposed. The coupling member 27 comprises a member 28 keyed to the vertical shaft' 25 and a second member 29 which is rotatably mounted on the shaft 25. The member 29 is secured to a bevelled gear 26' which meshes a second bevelled gear 26a', the latter being mounted on the longitudinally disposed shaft 31' for the drive of the reciprocating member in a manner indicated in Fig. 2.

Fig. 5 shows the position in which the motor shaft 8 is in driving connection with the longitudinally disposed shaft 31' for driving the reciprocating member. In order to shift from the reciprocating member to the rotating member the base of the housing 1' is slightly curved in upward direction toward the front end thereof and a tilting of the housing from the position shown in Fig. l, so that the front end base of the housing 1' engages the working surface of the article to be sanded, the leg extensions 40' of the lever 18 will shift at a predetermined angle due to the friction of the bottom pieces on the working surface to a position in which the coupling member 27' is shifted into the uncoupled position, while the coupling member 12 is shifted into the coupled position, thereby providing driving connection between the shaft 8 and chain gear 16 for the drum 7'. A return tilting movement of the housing 1 brings about a shifting of the driving connection drum 7 to the drive for the reciprocating member.

Referring now to Figs. 7 and 8, a structure is provided which again automatically, without any hand operation, brings about shifting of the drive from one operating member to that of the other operating member by mere tilting of the housing 12. that shown in Figs. 5 and 6 and comprises again the motor shaft 82 carrying a bevelled gear 92 as well as the coupling member 122 with its specific members 132 and 142, the latter being connected with aV bevelled gear 102 whichl meshes a second gear 10a2 mounted on a cross- This structure is similar toshaft 112 which also carries a chain gear 152 for driving the drun172 over a second chain gear 162 by means of a chain 173. A double lever 182 is again provided having forked arms 192 and 232 which operate the coupling members 122 and 272, respectively. The bevelled gear 92 meshes the bevelled gear 242 which is mounted on the vertical shaft 252 carrying the coupling member 272 which consists of the membersl 282' and 292, the latter being secured to the bevelledv gear 262 which meshes the bevelled gear 26:12 mounting on the longitudinally disposed shaft 312. The housing 12 isA equipped with a roller 412 properly mounted therein and disposed substantially at a point where the upwardly curvedv portion of the base of the housing 12 begins. The arm 192 of the lever 182 carries an abutting arm 422 disposed substantially in longitudinal direction in the housing 12 and engaging the inclined face 433 of a shifting member 442. The latter forms the head of a t'elescopng member 452 which by means of: a helical spring 462 is' maintained in expanded position and which is formed at its bottom to a ballshaped leg`473.

Fig. 7 shows.k the coupling member 272111 coupled position while the coupling member 122 is in uncoupled position. Upon tilting the housing 12^theleg 472 will contact the working surface and overcoming the force of the spring 462;. the shifting member will be moved slightly upward inl direction,l at the samel time moving the abutting arm in axial direction of the latter and bring about -a coupling position of the coupling member 122 and due to the operation of double armed lever 182, simultaneously the uncoupled position of thel coupling member 272. In this case the reciprocating member will stand still while the drum 72 is brought into drive connect-ion with the motor shaft 82;

Referring now to Figs. 9 and 10', a structure similar to that shown in Figs. 7 and 8 is disclosed in which again the mere tilting of the housing 13 brings about the shifting of the drive. from one operating member to that of the other operating member. The device comprises the motor shaft 83 on which the bevelled gear 93 is secured. The motor shaft 83 carries also the coupling member 123 consisting ofthe members 133 and 143, the latter being connected with the bevelled gear 103. The bevelled gear 93 meshes the bevelled gear 243 mounted on the vertical shaft 253 on. which: also the coupling member 273 is disposed. The latter consists. of' the` members 283 and 293, the latter being rotatably secured on the shaft 253 and secured to the Abevelled gear 263 which meshes the bevelled gear 26u13 mounted on the longitudinally disposed shaft 313. The doublel armed: lever 183 vhaving forked arms 193 and 233 operates the members 123 and 273.

The bevelled gear 103 meshes anotherV bevelled gear 1.0513 mounted. on avertical shaft 10b3 the end of which is formed toa worm` 1063 which meshes a Worm gear 1.0113. The worm gear 10d3 isV mounted on an axis which is identical with a pivotal axis 213 of the double hand lever 183. The shaft carrying` the Worm gear also has keyed thereon the chain gear 153 which over a chain 173 drives a second chain gear 163 for the drive of the drum 73. The axis 213 on whichl the double hand lever 183 is pivoted, which coincides with the shaft in which the worm gear 10:13 is mounted, carries an arm 48.3 permitting lifting and lowering of the drum 73 upon the pivotal axis 213. As shown in Fig. 9y the motor shaft 83 is in driving connection with the longitudinally disposed shaft 313 for the drive of the reciprocatingmember. The lever 183 being in connection with the arm 483, a raising of the drum 73 brought about by mere tilting of the housing 13 and engagement of the drum 73 with the operating surface, will shift the lever 183 for a predetermined angle in such manner that the coupling member 123 will be brought in coupled positionandsimultaneously the coupling member 273 will be brought into its uncoupled position. By this arrangement the shaft 83 will now be in direct driving connection with the chain gear 163 driving the drum 73 over the gears 103, a3, the worm 10c3, the worm gear 10d3 and the chain gear 153. Upon return tilting movement of the housing the drum 73 will return to its lowermost position and the arm 483 will necessarily reverse again the positions of the respective coupling members 123 and 273.

The axis of the drum 7 may be supported in the side walls of the housing 1 and may be extended beyond one of the side walls to receive a rotating saw blade 49 (Fig. l or any other rotating tool.

While l have disclosed several embodiments for the present invention it is to be understood that these embodiments are given by example only and not in a limiting sense, the scope of the invention being determined by the objects and claims.

I claim:

l. A sanding device comprising a housing, a flat surface reciprocating sanding member slidably fitted to one end of said housing for longitudinal reciprocating movement, a drum sanding member, a drum supporting shaft rotat- `ably mounted at the other end of said housing, the drum axis being positioned at right angles to the line o-f move` ment of the reciprocating sander and the drum surface being displaced from the plane of the reciprocating sander, a roller rotatably mounted in the housing between the sanding members having its axis parallel to the drum axis and its surface in the plane of the reciprocating sander, a motor mounted in the housing over the reciprocating sanding member and having a drive shaft parallel to the direction of motion of the reciprocating sanding member, a reciprocating drive mechanism for the reciprocating sander having its axis vertically disposed below the motor drive shaft, a vertical connecting shaft between the motor drive shaft and the reciprocating drive mechanism, coupling means for said connecting shaft, a cross shaft rotatably mounted to the housing in a direction parallel to the axis of the drum and intersecting the axis of the motor drive shaft, coupling means for said cross shaft, connecting means between the cross shaft and the drum supporting shaft to cause the two shafts to rotate simultaneously, gearing means to transmit rotation of the drive shaft to the connecting shaft and the cross shaft, a lever arm pivotally mounted on the housing and projecting through said housing, said lever being adapted to simultaneously operate both coupling means to alternatively actuate the drum sanding member and the reciprocating sanding member, a gripping member attached to the housing above the reciprocating sanding member, and a second gripping member attached to the housing above the drum sanding member.

2. A sanding device comprising a housing, a flat surfaced reciprocating sanding member slidably fitted to one end of said housing for longitudinal reciprocating movement, a drum sanding member, a drum supporting shaft rotatably mounted at the other end of said housing the drum axis being at right angles to the line of movement of the reciprocating sander and its surface displaced from the plane of the reciprocating sander, a roller rotatably mounted in the housing between the sanding members having its axis parallel to the drum axis and its surface in the plane of the reciprocating sander, a motor mounted in the housing and having a drive shaft, a reciprocating drive mechanism for the reciprocating sander, connecting means between the motor drive shaft and the reciprocating drive mechanism, coupling means for said connecting means, second connecting means between the motor drive shaft and the drum supporting shaft, second coupling means for said second connecting means, a lever pivotally connected to the housing and extending outside the housing said lever being adapted to simultaneously operate both coupling means to alternatively engage the drum sanding member and the reciprocating sanding member, a gripping member attached to the housing above the reciprocating sander, and a second gripping member attached to the case above the drum sanding member.

3. A sanding device comprising a housing, a iiat surfaced sanding member fitted to one end of said housing, a cylindrical drum sanding member fitted to the other end of said housing, said drum having its axis parallel to the plane of the flat sanding member, said drum sanding member being laterally displaced from the vertical projection of the fiat surfaced sanding member, and vertically displaced from the projection of the plane of the flat surfaced sanding member, a motor, driving connections between the motor and the flat surfaced sanding member, a cylindrical rotating supporting pivot member fitted to the case between the two sanding members having its axis parallel to the axis of the drum sander and its cylindrical supporting surface tangent to and forming a line of contact with the projected plane of the flat surfaced sanding member, and two gripping members for the case laterally displaced on either side of the pivot in the direction of the sanding members whereby vertical pressure on each gripping member will rotate the entire case about the pivot member and bring one sanding member into parallel contact with the working surface.

4. A sanding device comprising a housing, a drum sanding member, and a iiat surfaced sanding member, having a working surface in a plane parallel to the drum axis said plane being displaced from the drum surface, a motor for driving said sanding members, driving connections including double coupling means for alternatively connecting either sanding member to the motor, a cylindrical rotating supporting pivot member located between the sanding members, said pivot member having its axis of support parallel to the axis of the drum and its workengaging surface in the plane passing through the working surface of the iiat surfaced sanding member and so positioned that the sanding members can be alternatively positioned parallel to the working surface by rocking the device about the pivot member, gripping mem`bers at opposite ends of the housing for alternatively positioning one of the sanding members in operative position, and means operative upon rocking movement of the device from one sanding position to the other for actuating the coupling means to couple to the motor the sanding member in operative relation to the work and to disconnect from the motor the other sanding member.

5. A sanding device comprising a housing, a reciprocating sanding member, a drum sanding member longitudinally displaced from the reciprocating sanding member and vertically displaced from the plane of the reciprocating sanding member, a motor for driving said sanding members, driving connections including double coupling means for alternatively connecting either sanding member to the motor, at least one rotating cylindrical supporting pivot member between the sanding members positioned so that the device normally rests on said pivot and the reciprocating sanding member, the pivot member having its axis parallel to the axis of the drum and having its supporting surface in the plane passing through the working surface of the reciprocating sanding member, and a pair of gripping members attached to the case at least one of which is located on the same side of the pivot as the drum whereby a downward force exerted upon said gripping member will rock the drum sanding member about the pivot member into a line of contact with the working surface.

References Cited in the file of this patent UNITED STATES PATENTS 573,697 Petry Dec. 22, 1896 643,469 Clise Feb. 13, 1900 884,433 Veronneau Apr. 14, 1908 1,337,890 Doi-then Apr. 20, 1920 1,548,439 Boucher Aug. 4, 1925 1,553,456 Metrakos Sept. 15, 1925 2,526,976 Smith Oct. 24, 1950 2,553,924 Lillquist May 22, 1951 2,607,232 Von Haase Aug. 19, 1952 

